I finally got it! I have added Bluetooth and SD card to my Fiat 500 Pop 2012, it has a Bosch 312 MP3 AUX2. Here is what need to do:
1. Purchase this with BT module from ebay:
"Bluetooth BT Fiat and Alfa Romeo AUX adapter interface USB SD Punto 500 147 idea"
2. Install it to the CD Changer socket at the back.
3. Start the car, press "CD" once for the "CD Changer" to appear. Done!
Simple steps and solved all my problem!
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